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Once you start getting out a few saprolings and devour them it gets easier to make more saprolings to devour again. Sporesower helps your other thallids get spore counters, thus getting saprolings out quicker. Shell-dweller is a good stall creature. Imagine 5 saps on the field, devour with thunder-thrash for a 15/15. Cast fungal sprouting, now you've got 15 saps. Devour with mycoloth for a 30/30. Next turn get 30 saps, devour with helkite hatchling, 30/30 flying and trample. And that's not factoring in doubling season. I know there are decks out there designed to make literally thousands of saprolings but I feel this is a bit more versatile and a little more realistic.
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